Revert of Remove void** from disk_cache interface.

net/tools/dump_cache/simple_cache_dumper.cc

Index: net/tools/dump_cache/simple_cache_dumper.cc
diff --git a/net/tools/dump_cache/simple_cache_dumper.cc b/net/tools/dump_cache/simple_cache_dumper.cc
index dd5ecbf15f65c010896502d80379468257fa7f06..56162ca3e10905e2e327ea3a807f20519047d947 100644
--- a/net/tools/dump_cache/simple_cache_dumper.cc
+++ b/net/tools/dump_cache/simple_cache_dumper.cc
@@ -26,6 +26,7 @@
       output_path_(output_path),
       writer_(new DiskDumper(output_path)),
       cache_thread_(new base::Thread("CacheThead")),
+      iter_(NULL),
       src_entry_(NULL),
       dst_entry_(NULL),
       io_callback_(base::Bind(&SimpleCacheDumper::OnIOComplete,
@@ -149,15 +150,15 @@
   DCHECK(!dst_entry_);
   DCHECK(!src_entry_);
   state_ = STATE_OPEN_ENTRY_COMPLETE;
-  if (!iter_)
-    iter_ = cache_->CreateIterator();
-  return iter_->OpenNextEntry(&src_entry_, io_callback_);
+  return cache_->OpenNextEntry(&iter_, &src_entry_, io_callback_);
 }
 
 int SimpleCacheDumper::DoOpenEntryComplete(int rv) {
   // ERR_FAILED indicates iteration finished.
-  if (rv == ERR_FAILED)
+  if (rv == ERR_FAILED) {
+    cache_->EndEnumeration(&iter_);
     return OK;
+  }
 
   if (rv < 0)
     return rv;